﻿// Copyright 2020-2022 Andreas Atteneder
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//

namespace GLTFast.Schema {

    /// <summary>
    /// Joints and matrices defining a skinned mesh.
    /// </summary>
    [System.Serializable]
    public class Skin : NamedObject {
        
        /// <summary>
        /// The index of the accessor containing the
        /// floating-point 4x4 inverse-bind matrices.
        /// </summary>
        public int inverseBindMatrices = -1;
        
        /// <summary>
        /// The index of the node used as a skeleton root.
        /// </summary>
        public int skeleton = -1;
        
        /// <summary>
        /// Indices of skeleton nodes, used as joints in this skin.
        /// </summary>
        public int[] joints;
        
        internal void GltfSerialize(JsonWriter writer) {
            writer.AddObject();
            GltfSerializeRoot(writer);
            if (inverseBindMatrices >= 0)
            {
                writer.AddProperty("inverseBindMatrices", inverseBindMatrices);
            }
            if (skeleton >= 0)
            {
                writer.AddProperty("skeleton", skeleton);
            }
            if (joints != null && joints.Length > 0)
            {
                writer.AddArrayProperty("joints", joints);
            }
            writer.Close();
        }
    }
}
